Battery Mode_ Single Input_ Parallel Units - Delta Modulon DPH Series User Manual

3.1.10 Battery Mode_ Single Input_ Parallel Units

If the main AC source cannot supply power, for example, when unstable voltage or a power
outage occurs, all parallel UPSs will automatically transfer from online mode to battery
mode. During the conversion process, output voltage remains the same, and during battery
mode, each UPS's tri-color LED illuminates yellow and each UPS's LCD shows the text
'Battery' in the upper right corner. Please refer to Figure 3-10 for the path of electrical
power through the parallel UPSs in battery mode.
UPS 1
MAIN
Batteries
UPS 2
MAIN
Batteries
(Figure 3-10: Battery Mode Diagram_ Single Input Parallel Units)
Q2
Static Switch
Rectifier
Q1
Q2
Static Switch
Rectifier
Q1
3-9
Inverter
Q3
Inverter
Q3
3 Operation Modes
LOAD